Ignoring skill trees in a game like this makes no sense. I'm not a blindfolded, no hit, no upgrade run kinda guy. I want to clear any way I can short of using a cheat engine.
I have 1 gourd upgrade along with the skill that gives you more health on drinking it. Also grabbed both stealth upgrades, and a few other random ones. I'd like the Mirikiri damage boost, but I think that'd take quite a while to unlock. Nothing else left but to fight the Ogre, The Drunkard, or (if I can get past the ogre without fighting him) those other minibosses in the castle.